Spitballing here: - Driver source code may contain info that would give hints to upcoming or in-development products and innovations from the company that they

Spitballing here: - Driver source code may contain info that would give hints to upcoming or in-development products and innovations from the company that they'd prefer to keep secret. - Drivers may have features disabled in software, but not in hardware - if you could compile your own, it would effectively overrule this. - Open-sourcing drivers may make it easier for the competition to "copy" innovations and features - "Security" via obfuscation